Appliance for extracting or inserting studs of driving-chains.



A. E. CARTER.

APPLIANCE FOR EXTRACTING 0R INSERTING STUDS 0F DRIVING CHAINS.

APPLICATION FILED NOV. 3. I914.

Patented Dec, 12; 1916.

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ADRIAN E'II-IEIPBERT CARTER, or MANCHESTER, ENGLAND, assrsnon T0 Hans"RENOLD LIMITED, o'FDID-sBURY, MANCHES'IEIIQENGLAND, A oon'rona'rron orGREAT BRITAIN AND IRELAND.

APPLIANCE FOR EXTRACTING- OR INSERTING STUDS OF DRIVING-CHAINS.

Specification of Letters Patent.

Patented Dec. as, rare.

Application filed November 3, 1914. Serial No. 870,109.

b all whom it may concern:

Be it known that I, ADRIAN ETI-IELBERT Canirnn, a subject of the King ofGreat Britain, and resident of Progress Works, Brook street, Manchester,England, have inventedcertain new and useful Improvements in Appliancesfor Extracting or In serting 'Studs of Driving-Chains, of which thefollowing is a specification.

This invention relates to appliances for extracting studs from, orinserting them into the linl rplates of driving chains-for instance whena damaged link is'to be replaced by a new one. The device is of the typewherein the link-plates are supported by the jaw of a cramp while thestud is beingforced out of or into position by a screw-stem or the like.

It is the principal object of the invention to provide appliances forextracting or inserting studs of driving chains, which shall beapplicable to chains suchas are used on motor cycles and pedal cycles,and shall operate without tightening the link-plates against the rollerand thus preventing it froni turning on the bush.

A' further object is to provide a tool which can be used with varioussizes of chains.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is a perspective view of a screwcramp; Fig. 2 is an endelevation of the screw-cramp in a position for extracting a stud; Fig. 3is aside elevation of the screwcramp with the fork hinged back and achain link in the position for inserting a stud, and Fig. 4 isaperspective view of a screw-cramp with four movable forks.

Referring more particularly to Figs. '1, 2 and 3, c is the frame of ascrew-cramp having a slotted jaw at a, and b is a fork pivoted to thesaid frame by means of a screw pin j. In the type of cramp illustrated,a screw-stem 61 works in a boss 6 formed on the frame 0. In Figs. 2- and3 a piece of bush roller chain is shown in the cramp, in the positionsfor extracting and for inserting a stud respectively.

l/Vhen studs are to be inserted they will be already carried at one endby the outer linkplate 9 of Fig. 3. The other outer linkplate h isplaced as in Fig. 3 to straddle the lot n of the jaw a, and the end ofone stud f is then forced into the stud-hole by the thrust pin cl,whichis screwed down onto the stud 7 as in Fig. 3. The stud at the other endof the link plate 9 is then forced into the link plate It in the samemanner.

' When a stud is to be extracted the upper linkrulate (I, F s supportedy the prongs of the fork 'b which are adapted to pass under and supportthe upper linkplate of the inner combination on each side of the roller,as shown in Fig. 2. The upper end of the stud can then be forced out ofthe upper link-plate g of the outercombination by means of the thrustpin d.

I Stud-cramps made in accordance with the present invention may beconstructed to operate on a wider range of different sizes of chain byproviding them with several forks one for each range of sizes. Then eachfork can be used also as a jaw for the insertion of studs. Such astud-cramp, with four forks, is shown in perspective in Fig. 4, althoughonly three of the forks are visible. These forks b 72 b are formed onorattached to a boss is, which is adapted to slide to and fro, and alsoto turn upon, a cylindrical stub Z, which is carried at the lower end ofthe frame 0 by means of a boss m. This boss is provided with a ledge oto serve as a support for the free ends of the forks. The slots of theforks may be formed of gradually varying width, as shown in the fork 6or they may be cut to one width part of the way, and of a narrower,width for the rest of the way, as shown in the fork o When a stud is tobe extracted the boss 70 is pulled back along the stub Z until the freeends of the forks are clear of the support 0. A stop or enlarged end 79prevents the boss 70 from coming off the stub Z. The chain-joint is thensupported on the outer or end part of a fork of appropriate size, in themanner shown in Fig. 2; the boss is turned if necessary, so that when itis pushed forward again the free ends of the selected fork will besupported by the ledge 0'. The fork is then pushed forward until thestud is underneath the thrust pin 03, by which it can be forced out asalready described. When a stud is to be inserted, the lower link-plateis laid on the top of the fork but nearer to its base, the fork thenacting as the jaw a of Figs. 1 to 8; the chain-joint with the link-platealready carrying the Studs in place is held in position above it, sothat the stud can be forced home by the thrust pin d. In the figure thefork in use is shown in the position which it would occupy when a studis to be inserted; when a stud is to be extracted the fork would bedrawn back a little along the stub Z, to bring the center of the widerpart of the slot underneath the thrust pin d. It will be obvious thatwhen there is a set of forks b as in Fig. 4, a fork which is used forextracting studs from chains of one size, will serve also for theinsertion of studs in chains of the next larger size. I

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is: I

1.- A chain cramp for use in extracting and inserting the studs ofdriving chains, comprising a thrust-pin, a fork adapted to pass betweenthe links of a chain, a frame carrying the thrust-pin, means for movablysupporting the fork on the frame and permitting it to be adjusted inposition relatively to the thrust-pin, and means for operating thethrust-pin.

2. A chain cramp for use in extracting and inserting the studs ofdriving chains, comprising a thrustpin, a frame carrying the same andmeans for operating the thrustpin, a forkand means for carrying the samein a movable manner on the frame, said fork having jaws wider at onepartthan another, and adapted to pass between the links of a chain andto support the inner upper linkplate while the stud. is being forced outof the outer upper link-plate.

3. A chain cramp for use in extracting and inserting the studs ofdriving chains, comprising a thrust-pin, a frame carrying the same,means for operating the thrustpin, a stub on the frame, a boss adaptedto slidethereon, a fork on said boss, said fork being wider at its'outerpart than at its rear part, the outer part beingv adapted to passbetween the links of a chain when a stud is to to be removed, and therear part of the fork being adapted to support the outer link plate of'achain when a stud is to be forced thereinto, while the movements of theboss on the stub enable either part of the fork to be brought into linewith the thrustpin.

4. A chain cramp for use in extracting and inserting the studs ofdriving chains, comprising a frame, a thrust pin carried thereon, meansfor operating the thrust pin, a stub, a boss adapted to slide and toturn thereon, and a plurality of forks on said boss, said forks being ofdifferent widths one from another, whereby one or other fork can bebrought into position in line with the thrust pin according to thedimensions of the chain to be operated upon.

5. A chain cramp for use in extracting and inserting the studs ofdriving chains, comprising a thrust pin, a frame carrying the same,means for operating the thrust pin, a stub on the frame, a boss adaptedto slide thereon, a fork on said boss, said fork being wider at itsouter part than at its rear part, the outer part being adapted to passbetween the links of a chain when a stud is to be removed, and the rearpart of the fork being adapted to support the outer link plate of achain when a stud is to be forced thereinto, a ledge on the frame overwhich the end of av fork can slide when in line with the thrust pin,said ledge being adapted to assist in bearing the thrust on the forkduring the extraction and removal of studs from a chain, while thesliding movement is sufiicient to withdraw the fork from the ledge inorder to permit of the insertion of the fork between the links of achain.

In witness whereof, I have hereunto signed my name this 25th day ofSeptember, 1914, in the presence of two subscribing witnesses.

ADRIAN ETHELBERT CARTER.

Witnesses:

MALCOLM SMn'rHUnsT, GEORGE WEAVER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

